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相关概念视频

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

636
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
636
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

173
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
173
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

675
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
675

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相关实验视频

Updated: Jun 9, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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基于二次波的磁纳米粒子样本的空间定位方法的研究.

Zheyan Wang1, Ping Huang1, Fuyin Zheng1

  • 1School of Information Science and Engineering, Shenyang University of Technology, Shenyang 110870, China.

Micromachines
|October 26, 2024
PubMed
概括

这项研究引入了一种新的方法,用于使用第二波信号检测的磁性跟踪器的深度空间定位. 开发的手持设备准确地确定了追踪器深度,推进了生物医学检测技术.

关键词:
在 DC 偏差场中, DC 偏差场具有偏差.兰格温的函数函数磁性纳米粒子是一种磁性纳米粒子.第二和的第二和.断层测定定位定位器 断层测定位定位器

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相关实验视频

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科学领域:

  • 生物医学工程 生物医学工程
  • 磁力学 在磁力学方面.
  • 信号处理 信号处理

背景情况:

  • 目前的磁跟踪器检测系统使用基本的波信号采集,使它们容易受到干扰,缺乏本地化功能.
  • 这限制了它们的临床适用性,特别是用于深层组织成像和诊断.

研究的目的:

  • 开发一种用于深度空间定位磁性跟踪器的新方法.
  • 创建一个手持设备,用于精确的磁性纳米粒子追踪器检测.

主要方法:

  • 在非零场点利用第二波信号检测.
  • 使用非线性线圈特征和朗格温函数开发相关性模型.
  • 合交流激发和直流偏差场,以获得第二波响应.

主要成果:

  • 建立了一个连接信号峰值和偏差场的模型,用于精确的追踪器空间位置.
  • 证明直流偏差场表示轴距离,独立于粒子度.
  • 在实验验证中获得了高准确度,检测距离 (4.8%) 和度 (4.1%) 的误差很低.

结论:

  • 和的直流偏差场准确地确定了磁纳米粒子样本检测深度.
  • 开发的方法使手持式探针能够用于断层扫描的痕迹检测.
  • 这项研究为推进磁性敏感生物医学检测技术提供了一种新的方法.